To be used a as a best-guestimate only. The older the age, the closer you will be to the approximate eventual weight.
| Birth |
2½ oz. |
2¾ oz. |
3 oz. |
3½ oz. |
4 oz. |
4¼ oz. |
4½ oz. |
5 oz. |
5½ oz. |
6 |
6.5 |
7 |
7.5 |
8 |
8.5 |
8 |
9.5 |
10 |
10.5 |
11 |
11.5 |
12 |
12.5 |
13 |
13.5 |
14 |
14.5 |
15 |
15.5 |
16 |
16.5 = 1 lb |
17 |
17.5 |
18 |
18.5 |
19 |
19.5 |
20 |
20.5 |
21 |
21.5 |
22 |
22.5 |
23 |
23.5 |
24 |
24.5 |
25 |
25.5 |
26 |
26.5 |
27 |
27.5 |
28 |
28.5 |
29 |
29.5 |
30 |
30.5 |
31 |
31.5 |
32 |
32.5 |
33 |
33.5 |
34 |
34.5 |
35 |
35.5 |
36 |
36.5 |
37 |
37.5 |
38 |
38.5 |
39 |
39.5 |
40 |
40.5 |
41 |
41.5 |
42 |
42.5 |
43 |
43.5 |
44 |
44.5 |
45 |
45.5 |
46 |
46.5 |
47 |
47.5 |
48 = 2 lbs 'WowWua-Huahu'! - or ouch! |
48.5 |
49 |
49.5 |
50 |
50.5 |
51 |
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| 1 week |
3¾ |
4 |
5 |
5½ |
6½ |
7 |
8 |
9 |
9½ |
|
12 |
|
14 |
|
16 |
|
18 |
|
20 |
|
22 |
|
24 |
|
26 |
|
28 |
|
30 |
|
32 |
|
34 |
|
36 |
|
38 |
|
40 |
|
42 |
|
44 |
|
46 |
|
48 |
|
50 |
|
52 |
|
54 |
|
56 |
|
58 |
|
60 |
|
62 |
|
64 |
|
66 |
|
68 |
|
70 |
|
72 |
|
74 |
|
76 |
|
78 |
|
80 |
|
82 |
|
84 |
|
86 |
|
88 |
|
90 |
|
92 |
|
94 |
|
96 |
|
98 |
|
100 |
|
102 |
104 |
106 |
108 |
110 |
112 |
114 |
116 |
118 |
120 |
122 |
124 |
126 |
128 |
130 |
132 |
134 |
136 |
138 |
140 |
142 |
144 |
146 |
148 |
150 |
152 |
154 |
156 |
158 |
160 |
162 |
| 2 weeks |
5 |
5½ |
6½ |
7 |
9 |
10 |
11 |
12½ |
13½ |
|
16 |
|
18 |
|
20 |
|
22 |
|
24 |
|
26 |
|
28 |
|
30 |
|
32 |
|
34 |
|
36 |
|
38 |
|
40 |
|
42 |
|
44 |
|
46 |
|
48 |
|
50 |
|
52 |
|
54 |
|
56 |
|
58 |
|
60 |
|
62 |
|
64 |
|
66 |
|
68 |
|
70 |
|
72 |
|
74 |
|
76 |
|
78 |
|
80 |
|
82 |
|
84 |
|
86 |
|
88 |
|
90 |
|
92 |
|
94 |
|
96 |
|
98 |
|
100 |
|
102 |
|
104 |
|
106 |
108 |
110 |
112 |
114 |
116 |
118 |
120 |
122 |
124 |
126 |
128 |
130 |
132 |
134 |
136 |
138 |
140 |
142 |
144 |
146 |
148 |
150 |
152 |
154 |
156 |
158 |
160 |
162 |
|
|
| 3 weeks |
6 |
7 |
8 |
9 |
11 |
13 |
14 |
16 |
17½ |
|
21 |
|
24 |
|
27 |
|
30 |
|
33 |
|
36 |
|
39 |
|
42 |
|
45 |
|
48 |
|
51 |
|
54 |
|
57 |
|
60 |
|
63 |
|
66 |
|
69 |
|
72 |
|
75 |
|
78 |
|
81 |
|
84 |
|
87 |
|
90 |
|
93 |
|
96 |
|
99 |
|
102 |
|
105 |
|
108 |
|
111 |
|
114 |
|
117 |
|
120 |
|
123 |
|
126 |
|
129 |
|
132 |
|
135 |
|
138 |
|
141 |
|
144 |
|
147 |
|
150 |
|
153 |
|
156 |
159 |
162 |
165 |
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|
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| 4 weeks |
7 |
8 |
9½ |
11 |
13 |
15 |
17 |
19½ |
21 |
|
25 |
|
29 |
|
33 |
|
37 |
|
41 |
|
45 |
|
49 |
|
53 |
|
67 |
|
71 |
|
75 |
|
79 |
|
83 |
|
87 |
|
91 |
|
95 |
|
99 |
|
103 |
|
107 |
|
111 |
|
115 |
|
119 |
|
123 |
|
127 |
|
131 |
|
135 |
|
139 |
|
143 |
|
147 |
|
151 |
|
155 |
|
159 |
|
163 |
|
167 |
|
171 |
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| 5 weeks |
8 |
9 |
11 |
13 |
15 |
17 |
19½ |
22 |
24 |
|
28 |
|
32 |
|
36 |
|
40 |
|
44 |
|
48 |
|
52 |
|
56 |
|
60 |
|
64 |
|
68 |
|
72 |
|
76 |
|
80 |
|
84 |
|
88 |
|
92 |
|
96 |
|
100 |
|
104 |
|
108 |
|
112 |
|
116 |
|
120 |
|
124 |
|
128 |
|
132 |
|
136 |
|
140 |
|
144 |
|
148 |
|
152 |
|
156 |
|
160 = 10lbs |
|
164 |
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|
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| 6 weeks |
9 |
11 |
12½ |
15 |
17½ |
20 |
22 |
24 |
27 |
|
33 |
|
39 |
|
45 |
|
51 |
|
57 |
|
63 |
|
69 |
|
75 |
|
81 |
|
87 |
|
93 |
|
99 |
|
105 |
|
111 |
|
117 |
|
123 |
|
129 |
|
135 |
|
141 |
|
147 |
|
153 |
|
159 |
|
165 |
|
171 |
|
177 |
|
183 |
|
189 |
|
195 |
|
201 |
|
207 |
|
213 |
|
219 |
|
225 |
|
231 |
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| 7 weeks |
10 |
12 |
14½ |
17 |
19½ |
22 |
24½ |
27 |
30 |
|
35 |
|
40 |
|
45 |
|
50 |
|
55 |
|
60 |
|
65 |
|
70 |
|
75 |
|
80 |
|
85 |
|
90 |
|
95 |
|
100 |
|
105 |
|
110 |
|
115 |
|
120 |
|
125 |
|
130 |
|
135 |
|
140 |
|
145 |
|
150 |
|
155 |
|
165 |
|
175 |
|
185 |
|
195 |
|
205 |
|
215 |
|
225 |
|
235 |
|
245 |
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| 8 weeks |
11 |
13 |
16 |
19 |
21½ |
24 |
27 |
29 |
33 |
|
40 |
|
47 |
|
54 |
|
61 |
|
68 |
|
75 |
|
82 |
|
89 |
|
96 |
|
113 |
|
120 |
|
127 |
|
134 |
|
141 |
|
148 |
|
155 |
|
162 |
|
169 |
|
176 |
|
183 |
|
190 |
|
197 |
|
204 |
|
211 |
|
218 |
|
225 |
|
232 |
|
239 |
|
246 |
|
253 |
|
260 |
|
267 |
|
274 |
|
281 |
|
288 |
|
295 |
|
302 |
|
309 |
|
316 |
|
323 |
|
330 |
|
337 |
|
344 |
|
351 |
|
357 |
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| 9 weeks |
12 |
15 |
17½ |
20 |
23 |
26 |
29 |
32 |
35 |
|
41 |
|
47 |
|
53 |
|
59 |
|
65 |
|
71 |
|
77 |
|
83 |
|
89 |
|
95 |
|
101 |
|
107 |
|
113 |
|
119 = 7.4lbs |
|
125 |
|
131 |
|
137 |
|
143 |
|
149 |
|
155 |
|
161= 10 lbs |
|
167 |
|
173 |
|
179 |
|
185 |
|
191 |
|
197 |
|
203 |
|
209 |
|
215 |
|
221 |
|
226 |
|
232 |
|
238 |
|
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| 10 weeks |
13 |
16 |
19 |
22 |
25 |
28 |
31 |
34 |
38 |
|
45 |
|
52 |
|
59 |
|
66 |
|
73 |
|
80 |
|
87 |
|
94 |
|
101 |
|
108 |
|
115 |
|
122 |
|
129 |
|
136 |
|
143 |
|
150 |
|
157 |
|
164 |
|
171 |
|
178 |
|
185 |
|
192 |
|
199 |
|
206 |
|
213 |
|
220 |
|
227 |
|
234 |
|
241 |
|
248 |
|
255 |
|
262 |
|
269 |
|
276 |
|
283 |
|
290 |
|
297 |
|
304 |
|
311 |
|
318 |
|
325 |
|
332 |
|
339 |
|
346 |
|
353 |
|
|
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|
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| 11 weeks |
14 |
17 |
21 |
24 |
27 |
31 |
34 |
37 |
42 |
|
50 |
|
58 |
|
66 |
|
74 |
|
82 |
|
90 |
|
98 |
|
106 |
|
114 |
|
122 |
|
130 |
|
138 |
|
146 |
|
154 |
|
162 |
|
170 |
|
178 |
|
186 |
|
194 |
|
202 |
|
210 |
|
218 |
|
226 |
|
232 |
|
240 |
|
248 |
|
256 |
|
262 |
|
270 |
|
278 |
|
286 |
|
294 |
|
302 |
|
310 |
|
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|
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| 12 weeks |
15 |
19 |
22 |
26 |
30 |
33 |
37 |
41 |
45 |
|
53 |
|
61 |
|
69 |
|
77 |
|
85 |
|
93 |
|
101 |
|
109 |
|
117 = 7.3lbs |
|
125 |
|
133 |
|
141 |
|
149 |
|
157 |
|
165 = 10lbs |
|
173 |
|
181 |
|
189 |
|
197 |
|
205 |
|
213 |
|
221 |
|
229 |
|
237 |
|
245 |
|
253 |
|
261 |
|
269 |
|
277 |
|
285 |
|
293 |
|
301 |
|
309 |
|
317 |
|
325 |
|
333 |
|
341 |
|
349 |
|
357 |
|
365 |
|
373 |
|
381 |
|
389 |
|
397 |
|
405 = 25 lbs |
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|
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| 13 weeks |
16 |
20 |
24 |
28 |
32 |
36 |
40 |
44 |
49 |
|
59 |
|
69 |
|
79 |
|
89 |
|
99 |
|
109 |
|
119 |
|
129 |
|
139 |
|
149 |
|
159 |
|
169 |
|
179 |
|
189 |
|
199 |
|
209 |
|
219 |
|
229 |
|
239 |
|
249 |
|
259 |
|
269 |
|
279 |
|
289 |
|
299 |
|
309 |
|
319 |
|
329 |
|
339 |
|
349 |
|
359 |
|
369 |
|
379 |
|
389 |
|
|
|
|
|
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|
| 14 weeks |
17 |
22 |
26 |
30 |
34 |
39 |
43 |
47 |
52 |
|
62 |
|
72 |
|
82 |
|
92 |
|
102 |
|
112 |
|
122 |
|
132 |
|
142 |
|
152 |
|
162 = 10 lbs |
|
172 |
|
182 |
|
192 |
|
202 |
|
212 |
|
222 |
|
232 |
|
242 |
|
252 |
|
262 |
|
272 |
|
282 |
|
292 |
|
302 |
|
312 |
|
322 |
|
332 |
|
342 |
|
352 |
|
362 |
|
372 |
|
382 |
|
392 |
|
402 = 25lbs |
|
412 |
|
422 |
|
432 |
|
442 |
|
452 |
|
462 |
|
472 |
|
482 |
|
492 |
|
502 |
|
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